In 2003 it was decided by the Mitsubishi to provide these figures. It’s convenient to put small luggage in Pajero cargo space. In Mitsubishi Pajero you get 1293 liters of free space in the trunk. You also may put the back seat of Pajero down to receive more space than 1293 liters. Effective space design in Mitsubishi gives more opportunities.
Check also if your luggage in 2002 Mitsubishi isn’t heavier than needed. It’s optimal for Mitsubishi in this model to have 1293 liters cargo capacity. Overloading Mitsubishi Pajero might be a great problem in future.